1 #ifndef BOOST_ARCHIVE_ITERATORS_ISTREAM_ITERATOR_HPP
2 #define BOOST_ARCHIVE_ITERATORS_ISTREAM_ITERATOR_HPP
3 
4 // MS compatible compilers support #pragma once
5 #if defined(_MSC_VER)
6 # pragma once
7 #endif
8 
9 /////////1/////////2/////////3/////////4/////////5/////////6/////////7/////////8
10 // istream_iterator.hpp
11 
12 // (C) Copyright 2002 Robert Ramey - http://www.rrsd.com .
13 // Use, modification and distribution is subject to the Boost Software
14 // License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
15 // http://www.boost.org/LICENSE_1_0.txt)
16 
17 //  See http://www.boost.org for updates, documentation, and revision history.
18 
19 // note: this is a custom version of the standard istream_iterator.
20 // This is necessary as the standard version doesn't work as expected
21 // for wchar_t based streams on systems for which wchar_t not a true
22 // type but rather a synonym for some integer type.
23 
24 #include <cstddef> // NULL
25 #include <istream>
26 #include <boost/iterator/iterator_facade.hpp>
27 
28 namespace boost {
29 namespace archive {
30 namespace iterators {
31 
32 // given a type, make an input iterator based on a pointer to that type
33 template<class Elem = char>
34 class istream_iterator :
35     public boost::iterator_facade<
36         istream_iterator<Elem>,
37         Elem,
38         std::input_iterator_tag,
39         Elem
40     >
41 {
42     friend class boost::iterator_core_access;
43     typedef istream_iterator this_t ;
44     typedef typename boost::iterator_facade<
45         istream_iterator<Elem>,
46         Elem,
47         std::input_iterator_tag,
48         Elem
49     > super_t;
50     typedef typename std::basic_istream<Elem> istream_type;
51 
equal(const this_t & rhs) const52     bool equal(const this_t & rhs) const {
53         // note: only  works for comparison against end of stream
54         return m_istream == rhs.m_istream;
55     }
56 
57     //Access the value referred to
dereference() const58     Elem dereference() const {
59         return static_cast<Elem>(m_istream->peek());
60     }
61 
increment()62     void increment(){
63         if(NULL != m_istream){
64             m_istream->ignore(1);
65         }
66     }
67 
68     istream_type *m_istream;
69     Elem m_current_value;
70 public:
istream_iterator(istream_type & is)71     istream_iterator(istream_type & is) :
72         m_istream(& is)
73     {
74         //increment();
75     }
76 
istream_iterator()77     istream_iterator() :
78         m_istream(NULL),
79         m_current_value(NULL)
80     {}
81 
istream_iterator(const istream_iterator<Elem> & rhs)82     istream_iterator(const istream_iterator<Elem> & rhs) :
83         m_istream(rhs.m_istream),
84         m_current_value(rhs.m_current_value)
85     {}
86 };
87 
88 } // namespace iterators
89 } // namespace archive
90 } // namespace boost
91 
92 #endif // BOOST_ARCHIVE_ITERATORS_ISTREAM_ITERATOR_HPP
93